const loadFile = function (name) {
  // name为文件所在位置
  let xhr = new XMLHttpRequest(),
    okStatus = document.location.protocol === "file:" ? 0 : 200;
  xhr.open("GET", name, false);
  xhr.overrideMimeType("text/html;charset=utf-8"); //默认为utf-8
  xhr.send(null);
  return xhr.status === okStatus ? xhr.responseText : null;
};
export default loadFile;
